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CVE-2023-54171

tracing: Fix memory leak of iter->temp when reading trace_pipe PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix memory leak of iter->temp when reading trace_pipe kmemleak reports: unreferenced object 0xffff88814d14e200 (size 256): comm "cat", pid 336, jiffies 4294871818 (age 779.490s) hex dump (first 32 bytes): 04 00 01 03 00 00 00 00 08 00 00 00 00 00 00 00 ................ 0c d8 c8 9b ff ff ff ff 04 5a ca 9b ff ff ff ff .........Z...... backtrace: [<ffffffff9bdff18f>] __kmalloc+0x4f/0x140 [<ffffffff9bc9238b>] trace_find_next_entry+0xbb/0x1d0 [<ffffffff9bc9caef>] trace_print_lat_context+0xaf/0x4e0 [<ffffffff9bc94490>] print_trace_line+0x3e0/0x950 [<ffffffff9bc95499>] tracing_read_pipe+0x2d9/0x5a0 [<ffffffff9bf03a43>] vfs_read+0x143/0x520 [<ffffffff9bf04c2d>] ksys_read+0xbd/0x160 [<ffffffff9d0f0edf>] do_syscall_64+0x3f/0x90 [<ffffffff9d2000aa>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 when reading file 'trace_pipe', 'iter->temp' is allocated or relocated in trace_find_next_entry() but not freed before 'trace_pipe' is closed. To fix it, free 'iter->temp' in tracing_release_pipe().

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected ff895103a84abc85a5f43ecabc7f67cf36e1348f before 1a1e793e021d75cd0accd8f329ec9456e5cd105e; affected ff895103a84abc85a5f43ecabc7f67cf36e1348f before 954792db9f61b6c0b8a94b8831fed5f146014029; affected ff895103a84abc85a5f43ecabc7f67cf36e1348f before be970e22c53d5572b2795b79da9716ada937023b; affected ff895103a84abc85a5f43ecabc7f67cf36e1348f before 3f42d57a76e7e96585f08855554e002218cbca0c; affected ff895103a84abc85a5f43ecabc7f67cf36e1348f before d5a821896360cc8b93a15bd888fabc858c038dc0
Linux / Linuxaffected 5.7; unaffected 0 before 5.7; unaffected 5.10.188 through 5.10.*; unaffected 5.15.121 through 5.15.*; unaffected 6.1.40 through 6.1.*; unaffected 6.4.5 through 6.4.*; unaffected 6.5 through *

CWE

No CWE identifiers supplied.

References