cve-2021-47077
Vulnerability from cvelistv5
Published
2024-03-01 21:15
Modified
2024-12-19 07:34
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: qedf: Add pointer checks in qedf_update_link_speed() The following trace was observed: [ 14.042059] Call Trace: [ 14.042061] <IRQ> [ 14.042068] qedf_link_update+0x144/0x1f0 [qedf] [ 14.042117] qed_link_update+0x5c/0x80 [qed] [ 14.042135] qed_mcp_handle_link_change+0x2d2/0x410 [qed] [ 14.042155] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042170] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042186] ? qed_rd+0x13/0x40 [qed] [ 14.042205] qed_mcp_handle_events+0x437/0x690 [qed] [ 14.042221] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042239] qed_int_sp_dpc+0x3a6/0x3e0 [qed] [ 14.042245] tasklet_action_common.isra.14+0x5a/0x100 [ 14.042250] __do_softirq+0xe4/0x2f8 [ 14.042253] irq_exit+0xf7/0x100 [ 14.042255] do_IRQ+0x7f/0xd0 [ 14.042257] common_interrupt+0xf/0xf [ 14.042259] </IRQ> API qedf_link_update() is getting called from QED but by that time shost_data is not initialised. This results in a NULL pointer dereference when we try to dereference shost_data while updating supported_speeds. Add a NULL pointer check before dereferencing shost_data.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/11014efcec378bb0050a6cf08eaf375e3693400aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/73578af92a0fae6609b955fcc9113e50e413c80fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a6362a737572f66051deb7637f3f77ddf7a4402fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/11014efcec378bb0050a6cf08eaf375e3693400aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/73578af92a0fae6609b955fcc9113e50e413c80fPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a6362a737572f66051deb7637f3f77ddf7a4402fPatch
Impacted products
Vendor Product Version
Linux Linux Version: 61d8658b4a435eac729966cc94cdda077a8df5cd
Version: 61d8658b4a435eac729966cc94cdda077a8df5cd
Version: 61d8658b4a435eac729966cc94cdda077a8df5cd
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   Linux Linux Version: 4.11
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This results in a NULL pointer dereference\\nwhen we try to dereference shost_data while updating supported_speeds.\\n\\nAdd a NULL pointer check before dereferencing shost_data.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: qedf: Agregar comprobaciones de puntero en qedf_update_link_speed() Se observ\u00f3 el siguiente seguimiento: [ 14.042059] Seguimiento de llamadas: [ 14.042061]  [ 14.042068] qedf_link_update+0x144/0x1f0 [ qedf] [14.042117] qed_link_update+0x5c/0x80 [qed] [14.042135] qed_mcp_handle_link_change+0x2d2/0x410 [qed] [14.042155]? qed_set_ptt+0x70/0x80 [qed] [14.042170]? qed_set_ptt+0x70/0x80 [qed] [14.042186]? qed_rd+0x13/0x40 [qed] [ 14.042205] qed_mcp_handle_events+0x437/0x690 [qed] [ 14.042221] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042239] qed_int_sp_dpc+0x3a6/0x3e0 [qed] [ 14.042245] tasklet_action_common.isra.14+0x5a/0x100 [ 14.042250] __do_softirq+0xe4/0x2f8 [ 14.042253] salida_irq+0xf7/0x100 [ 14.042255] do_IRQ+0x7f/0xd0 [ 14.042257] common_interrupt+0xf/0xf [ 14.042259]  API qedf_link_update() est\u00e1 siendo llamada desde QED pero en ese momento shost_data no est\u00e1 inicializado. Esto da como resultado una desreferencia del puntero NULL cuando intentamos desreferenciar shost_data mientras actualizamos las velocidades_compatibles. 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}


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