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pcmcia: Add error handling for add_interval() in do_validate_mem()

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[ Upstream commit 4a81f78caa53e0633cf311ca1526377d9bff7479 ]

In the do_validate_mem(), the call to add_interval() does not
handle errors. If kmalloc() fails in add_interval(), it could
result in a null pointer being inserted into the linked list,
leading to illegal memory access when sub_interval() is called
next.

This patch adds an error handling for the add_interval(). If
add_interval() returns an error, the function will return early
with the error code.

Fixes: 7b4884ca88 ("pcmcia: validate late-added resources")
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wentao Liang 2025-01-20 21:10:06 +08:00 • committed by Greg Kroah-Hartman
commit 5b60ed401b
1 changed files with 3 additions and 1 deletions
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4
drivers/pcmcia/rsrc_nonstatic.c
View file

@ -375,7 +375,9 @@ static int do_validate_mem(struct pcmcia_socket *s,
if (validate && !s->fake_cis) {
/* move it to the validated data set */
add_interval(&s_data->mem_db_valid, base, size);
ret = add_interval(&s_data->mem_db_valid, base, size);
if (ret)
return ret;
sub_interval(&s_data->mem_db, base, size);
}